From: Rabbi Moshe Sofer
To: Rabbi Pinchas
A Jewish arendar who subleases an inn to a non-Jew delivers chametz beverages before Pesach, but retains the contractual right to reclaim and exchange the goods at will. The Chasam Sofer rules stringently that this retained 'grip' violates bal yeira'eh.
Source: Shu"t Chasam Sofer OC §118